Create changelog

Author: mthh

CHANGELOG.md

@@ -0,0 +1,34 @@
+## Changelog
+
+### Current master (unreleased)
+
+- Add `x_origin`, `y_origin`, `x_step` and `y_step`
+  attributes to `ContourBuilder` struct. They can be set using the *builder pattern*, before calling
+  the `contours` method.
+
+- Create this changelog and complete it retroactively.
+
+### 0.6.0
+
+- Bump maximum supported geojson version to 0.24.
+
+### 0.5.0
+
+- Bump maximum supported geojson version to 0.23.
+
+### 0.4.0
+
+- Bump maximum supported geojson version to 0.22.
+
+### 0.3.0
+
+- Support a range of geojson crate versions instead of a specific one.
+
+### 0.2.0
+
+- Modernize error handling.
+- Bump supported geojson version to 0.19.
+
+### 0.1.0
+
+- First version